[ 43.827365][ T26] audit: type=1800 audit(1572747740.603:27): pid=7812 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 43.852783][ T26] audit: type=1800 audit(1572747740.603:28): pid=7812 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 44.767726][ T26] audit: type=1800 audit(1572747741.603:29): pid=7812 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 44.787061][ T26] audit: type=1800 audit(1572747741.603:30): pid=7812 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.220' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.944804][ T7961] [ 53.947165][ T7961] ============================= [ 53.951985][ T7961] WARNING: suspicious RCU usage [ 53.956904][ T7961] 5.4.0-rc5+ #0 Not tainted [ 53.961391][ T7961] ----------------------------- [ 53.966272][ T7961] ./include/linux/kvm_host.h:536 suspicious rcu_dereference_check() usage! [ 53.974960][ T7961] [ 53.974960][ T7961] other info that might help us debug this: [ 53.974960][ T7961] [ 53.985405][ T7961] [ 53.985405][ T7961] rcu_scheduler_active = 2, debug_locks = 1 [ 53.993482][ T7961] no locks held by syz-executor820/7961. [ 53.999125][ T7961] [ 53.999125][ T7961] stack backtrace: [ 54.005035][ T7961] CPU: 1 PID: 7961 Comm: syz-executor820 Not tainted 5.4.0-rc5+ #0 [ 54.012896][ T7961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.022927][ T7961] Call Trace: [ 54.026194][ T7961] dump_stack+0x1d8/0x2f8 [ 54.030499][ T7961] lockdep_rcu_suspicious+0x156/0x1c0 [ 54.035858][ T7961] kvm_dev_ioctl+0x1711/0x1fd0 [ 54.040600][ T7961] ? kvm_reboot+0x40/0x40 [ 54.044905][ T7961] do_vfs_ioctl+0x744/0x1730 [ 54.049478][ T7961] ? assoc_array_gc+0x13c1/0x1440 [ 54.054478][ T7961] ? tomoyo_file_ioctl+0x23/0x30 [ 54.059388][ T7961] ? security_file_ioctl+0xa1/0xd0 [ 54.064489][ T7961] __x64_sys_ioctl+0xe3/0x120 [ 54.069144][ T7961] do_syscall_64+0xf7/0x1c0 [ 54.073624][ T7961] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.079495][ T7961] RIP: 0033:0x440149 [ 54.083367][ T7961] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 54.102951][ T7961] RSP: 002b:00007ffc914f70e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 54.111338][ T7961] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440149 [ 54.119285][ T7961] RDX: 0000000000000002 RSI: 000000000000ae01 RDI: 0000000000000003 [ 54.127233][ T7961] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 54.135191][ T7961] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004019d0 [ 54.143136][ T7961] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 54.151856][ T7961] [ 54.154339][ T7961] ============================= [ 54.159160][ T7961] WARNING: suspicious RCU usage [ 54.164082][ T7961] 5.4.0-rc5+ #0 Not tainted [ 54.168586][ T7961] ----------------------------- [ 54.173409][ T7961] ./include/linux/kvm_host.h:631 suspicious rcu_dereference_check() usage! [ 54.182067][ T7961] [ 54.182067][ T7961] other info that might help us debug this: [ 54.182067][ T7961] [ 54.192317][ T7961] [ 54.192317][ T7961] rcu_scheduler_active = 2, debug_locks = 1 [ 54.200413][ T7961] no locks held by syz-executor820/7961. [ 54.206063][ T7961] [ 54.206063][ T7961] stack backtrace: [ 54.211932][ T7961] CPU: 0 PID: 7961 Comm: syz-executor820 Not tainted 5.4.0-rc5+ #0 [ 54.219803][ T7961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.229844][ T7961] Call Trace: [ 54.233111][ T7961] dump_stack+0x1d8/0x2f8 [ 54.237425][ T7961] lockdep_rcu_suspicious+0x156/0x1c0 [ 54.242772][ T7961] kvm_dev_ioctl+0x17b5/0x1fd0 [ 54.247514][ T7961] ? kvm_reboot+0x40/0x40 [ 54.251825][ T7961] do_vfs_ioctl+0x744/0x1730 [ 54.256390][ T7961] ? assoc_array_gc+0x13c1/0x1440 [ 54.261397][ T7961] ? tomoyo_file_ioctl+0x23/0x30 [ 54.266308][ T7961] ? security_file_ioctl+0xa1/0xd0 [ 54.271394][ T7961] __x64_sys_ioctl+0xe3/0x120 [ 54.276049][ T7961] do_syscall_64+0xf7/0x1c0 [ 54.280530][ T7961] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.286396][ T7961] RIP: 0033:0x440149 [ 54.290279][ T7961] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 54.309880][ T7961] RSP: 002b:00007ffc914f70e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 54.318265][ T7961] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440149 [ 54.326211][ T7961] RDX: 0000000000000002 RSI: 000000000000ae01 RDI: 0000000000000003 [ 54.334161][ T7961] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 54.342108][ T7961] R10: 0000000000000000 R11: